Bed area
length × widthFinds the surface area of a rectangular bed.
Inputs
Adjust the project details to update the estimate.
Planning estimates use standard formulas. Verify quantities with your supplier before ordering.
Estimate
Cover every bed at a consistent depth.
Mulch volume
Cubic yards including a small ordering allowance.
1.6 cu yd
Retail bags
Approximate bags using common coverage values.
0.8 tons
Material range
A planning window for bulk or bagged mulch.
$86–$171
Bed area: length × width
Estimates use standard planning formulas. Verify quantities with your supplier or contractor before ordering.
See your project with AIGarden bed coverage
Mulch Calculator
Estimate bulk or bagged mulch from bed dimensions and application depth. Compare material choices before the delivery truck arrives.
Free to use Instant results Planning estimate
How to calculate mulch for garden beds
Measure each bed and combine the areas. For curves, use smaller rectangles or calculate average width times length. Keep planting islands and hardscape out of the mulch area.
Choose a depth that protects soil without burying plants. Two to four inches is common for many beds, but settling, material type, and plant crowns should guide the final layer.
Bulk mulch usually makes sense for larger areas, while bags are easier to carry through narrow access. Delivery, spreading, edging, and old mulch removal belong in the full project plan.
Formulas used
Cubic yards
area × depth ÷ 12 ÷ 27Converts inches of depth into cubic yards.
Bag count
cubic_feet ÷ bag_coverageUses the coverage printed on the retail bag.
Frequently asked questions
What to know before you order.
What mulch depth should I use?
Two to four inches is common, but do not cover trunks, crowns, siding, or foundations. The appropriate depth also depends on the material and plants.
Is bulk mulch cheaper than bags?
Bulk is often less expensive for larger quantities, while bags can be more practical where access is tight or the project is small.
How often should mulch be refreshed?
Inspect it after settling and decomposition. Add only enough to restore the intended depth rather than layering endlessly.
See it before you build it
Try AI home design Give the planting beds a finished look
Preview mulch colors, planting compositions, and lawn transitions from an exterior photo with AI.